October 24, 2012

Warmer air temperatures high above the Antarctic led to the second smallest seasonal ozone hole in 20 years, according to NOAA and NASA satellite measurements. This year, the average size of the ozone hole was 6.9 million square miles (17.9 million square kilometers). The ozone layer helps shield life on Earth from potentially harmful ultraviolet (UV) radiation that can cause skin cancer and damage plants.

Before there were satellites, weather data transmitters, or computer databases, there were the ship’s logs of Arctic sea voyages, where sailors dutifully recording weather observations. Now, a new crowdsourcing effort could soon make of the weather data from these ship logs, some more than 150 years old, available to climate scientists worldwide.